NOTE: The above research paper refers to when using an electric coil inside the resonant cavity to produce a strong enough toggling polarity magnetic field but it should be possible to use a magnetic target material that can toggle at GHz frequencies and then use a strong microwave beam through a waveguide and small horn antenna next to the target material and eliminate the electric coil inside the resonate cavity.

Spin Wave TechnologyA book of informal research papers written by George J Bugh while investigating claims by many inventors and researchers who have built unusual electromagnetic devices said to produce anomalous energy output and even electrogravity effects.